Old Amsterdam Seeds provides gardening tips and expertise to help customers successfully grow various cannabis plant varieties. They offer guidance through an online blog with step-by-step pictures and contact form for questions. Several strain varieties are summarized, including Super Silver with 75% Sativa and 70 day flowering, a strong Purple Afghan plant that is easy to grow, and Jack Herrer with a 45% Sativa/55% Indica blend and 65 day flowering time. Their contact information and website is provided.